SYSTEM AND METHOD FOR ENCODING AND DECODING FOR MULTI-CHANNEL AUDIO

摘要

A system and a method for encoding and decoding multi-channel audio are provided to maintain compatibility with an existing multi-channel audio receiver and encode and decode a multi-channel audio signal of high quality by using SAC(Spatial Audio Coding) and SBR(Spectral Band Replication). A bit stream demultiplexing unit(301) demultiplexes a multiplexed bit stream into a multi-channel audio bit stream of a low sampling frequency, an SAC bit stream, and an SBR bit stream. A multi-channel audio decoding unit(303) decodes the multi-channel audio bit stream and outputs a down-mix signal and a multi-channel audio signal. An SBR decoding unit(305) decodes the down-mix signal and the SBR bit stream by an SBR type, and outputs a down-mix signal whose high frequency region is recovered. An SAC decoding unit(307) decodes the multi-channel audio signal by an SAC type by using a spatial queue included in the SAC bit stream and the down-mix signal whose high frequency region is recovered, and outputs a multi-channel audio signal of a high sampling frequency.